Use a Lightning Wallet to interface with the BoltATM. Click Here to get one.
Find an BoltATM, then...
Open your Lightning Wallet app
Scan an invoice QR code with the ATM (prices are for example only)
$1 bill = 900 sats
$5 bill = 8,300 sats
$10 bill = 17,600 sats
$20 bill = 36,200 sats
Insert the bill corresponding to your amount
The sats will be sent to your wallet